The 2025 event has concluded.

Chicago Marathon

Chicago, IL, USA • October 12, 2025
TopDescriptionCourse
Explorer

Subscribe

Get updates on the Chicago Marathon race forecast and be the first to know if the forecast shifts.

Text Updates

Maximum one update per day. Standard messaging rates apply. Currently only supports USA, UK, and Canada.

Phone Number

Email Updates

By submitting your email you agree to receive weather forecasts and racecast.io updates.

partly-cloudy-day Partly cloudy throughout the day.

Pace Calculator

Distance: 26.2mi
0:00:00
HH:MM:SS
Pace
—/mi
Weather Adj
—/mi
Common Goals:

The Chicago Marathon is a marathon (long-distance foot race) held every October in Chicago, Illinois. It is one of the six World Marathon Majors. Thus, it is also a World Athletics Label Road Race. The Chicago Marathon is the fourth-largest race by number of finishers worldwide. Wikipedia

Area Map

Course Map

FAQ

Ask a Question about the Chicago Marathon

Racecast Concierge (free during beta)

Ask a question about the Chicago Marathon and we'll do the hard part and find the answer for you within 48 hours.

By using Racecast Concierge, you agree to receive email alerts pertaining to the Chicago Marathon and general racecast.io updates.

When is the 2025 Chicago Marathon?

The 2025 Chicago Marathon will be held on Sunday October 12, 2025.

Is the Chicago Marathon a Boston Marathon Qualfier?

Yes, the Chicago Marathon is an official Boston Marathon qualifier.

Historical Weather

Based on 25 years of data
Avg Temp
64°F
L:51°H:64°
RunScore
7
Conditions
Rain Freq
12%
3 of 25 yrs
Wind11mph
Dew42°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults

2024 Chicago Marathon

Partly cloudy throughout the day.

2024
cloudy
59°/66°-
8

2023 Chicago Marathon

Partly cloudy throughout the day.

2023
partly-cloudy-day
47°/55°-
8

2022 Chicago Marathon

Becoming cloudy in the afternoon.

2022
partly-cloudy-day
46°/68°-
8

2021 Chicago Marathon

Partly cloudy throughout the day with afternoon rain.

2021
partly-cloudy-day
72°/75°Light
7

2020 Chicago Marathon

Partly cloudy throughout the day.

2020
cloudy
60°/67°-
9

2019 Chicago Marathon

Partly cloudy throughout the day.

2019
partly-cloudy-day
42°/54°-
6

2018 Chicago Marathon

Cloudy skies throughout the day with rain.

2018
cloudy
58°/60°Light
8

2017 Chicago Marathon

Partly cloudy throughout the day.

2017
clear-day
57°/77°-
8

2016 Chicago Marathon

Partly cloudy throughout the day.

2016
partly-cloudy-day
52°/63°-
8

2015 Chicago Marathon

Partly cloudy throughout the day.

2015
partly-cloudy-day
54°/77°-
7

2014 Chicago Marathon

Becoming cloudy in the afternoon with late afternoon rain.

2014
partly-cloudy-day
44°/62°-
8

2013 Chicago Marathon

Clear conditions throughout the day with early morning rain.

2013
clear-day
48°/63°-
9

2012 Chicago Marathon

Partly cloudy throughout the day.

2012
cloudy
40°/49°-
8

2011 Chicago Marathon

Clear conditions throughout the day.

2011
clear-day
59°/79°-
8

2010 Chicago Marathon

Partly cloudy throughout the day.

2010
partly-cloudy-day
60°/83°-
8

2009 Chicago Marathon

Partly cloudy throughout the day.

2009
partly-cloudy-day
32°/43°-
7

2008 Chicago Marathon

Partly cloudy throughout the day.

2008
partly-cloudy-day
62°/83°-
8

2007 Chicago Marathon

Partly cloudy throughout the day.

2007
partly-cloudy-day
71°/86°-
7

2006 Chicago Marathon

Cloudy skies throughout the day with rain clearing later.

2006
cloudy
38°/40°Light
6

2005 Chicago Marathon

Clearing in the afternoon.

2005
partly-cloudy-day
51°/58°-
8

2004 Chicago Marathon

Partly cloudy throughout the day.

2004
partly-cloudy-day
50°/61°-
8

2003 Chicago Marathon

Clear conditions throughout the day with early morning rain.

2003
clear-day
48°/68°-
8

2002 Chicago Marathon

Clear conditions throughout the day.

2002
partly-cloudy-day
39°/48°-
7

2001 Chicago Marathon

Partly cloudy throughout the day.

2001
partly-cloudy-day
35°/52°-
8

2000 Chicago Marathon

Becoming cloudy in the afternoon.

2000
clear-day
54°/68°-
9
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR
You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR